class Person:
    name = 'wyl350'
    age = 44
    def log(self):
        print(self.name)
        print(self.age)

Person().log()

class Car:
    wheels = 4
    def drive(self):
        print('行驶')

car = Car()
car.drive()
car.wheels = 44
print(Car.wheels)
print(car.wheels)

